I get wat you mean. Heavier at the temple end in order to balance the front part. Im just curious, if the back is heavier, wont the weight at the back also gets transferred to our nose in front as well? Or is the weight distribution at the back just limited to our ears only? I have tried Zen eyewear before, and like what you have said, the frame is pretty heavy when felt on the hands but when worn on the face dont really feel heavy. But due to my worry of the weight, I have not actually bought one to try it out yet. I may consider testing this point out in the future to see how well this theory holds water.
At the current moment, I only dare to wear titanium frames as I find that minimising the entire weight of my spectacles is very important. You are right in that my prescription is very high, as such my lenses are inevitably heavy, even though I have alreday used super high index & double aspheric design to cut the weight.
ok for me, I practically dumped my first pair of adult glasses (very big thick nerdy type)
because it felt horrible. on top of that I look (according to a girl) like a murderous rapist.(once I stopped and thanked the girl who held the lift open for me and smiled and when you're not moving, your perspiration condenses on the lenses and fogs up just as I gave her eye to eye contact..... she cringed......zzzz......)
then I switched to swissflex, polycarb lenses, still super light(low power)
but it felt like a brick to me because I'm not use to the feel
but once I got used to the feel.(1 year) even my original glasses felt "ok"
then from there I realised my swissflex were originally supposed to be curled behind my head instead of bent behind my ears.
so for a lot of straight templed frames I started doing that and they stop slipping.
the actual weight distrubution is behind the ears, and the frame must fit your head size so that you have the extra length to tuck it in(the thicker heavier part of the tips) to grip the head.
assuming the frame is suitable the weight should be distributed evenly left right and center so that you would not feel the weight at the front.
but take note, for those who are sensitive it make not help since it would then create other problems.
I feel lah, don't shoot me, double aspherical don't reduce weight that much since most who use it, desperate already , super thick not much to reduce.
but those high astig ones especially funny axis like 30 will feel more comfortable with less distortion. tia gong lens saleman say one about the distortion.